Recently Nanoleaf sent out a questioner about paying for magnetic mounting. I would be very interested in this type of mounting along with a magnetic paint for the walls. I intend to get some paint and painting my wall in order to experiment with this option I will post my results in the by next week.
Nanoleaf should make adhesive magnets with a plastic coating.
The magnet could then be glued to the backside of the panels, and the plastic coating will there to protect scratching the surface where it is mounted on.
In this way you could use white and or coloured glassboards as a reuseable surface.
Because of the plastic coating you can shift (glide ) the panels over the whiteboard while making a new design, without removing them from the metal surface
Sorry about the bad link, the URL is being changed when I enter it here. Try https://www.anchoragemuseum.org/dev/terra/index.html and scroll down to the 5th photo which shows the magnets glued to the backs of the panels. I used LOCTITE Ultra Liquid Control Super Glue to attach them. If you look closely at the photo, you can see the one position in the pattern on the back of the Aurora panel that is just the right size for the magnets I used.
The magnets I used have nice smooth surfaces, and wouldn't scratch the surface they're attached to. They're also VERY strong, and one is more than enough. The only problem is that is you try to pull the panel straight off the metal surface (rather than sliding it to the side), the magnet can sometimes detach from the panel.